Question: who served as a doctoral advisor for Srinivasa Ramanujan ?
Paraphrase: who served as a doctoral advisor for Srinivasa Ramanujan ?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q83163 wdt:P184 ?obj . ?obj wdt:P31 wd:Q5 } 
Answer: G.H. Hardy, John Edensor Littlewood